RELEASE OF RN-222 FROM SOME SOILS

Measurements have been made of Rn-222 release from diverse soils in th e region surrounding Malaga, Spain. These flux measurements were carri ed out by two methods. A direct method using a static chamber techniqu e and another indirect method obtained from concentration profile meas urements of Rn-222 in the soil air. The effects of meteorological vari ables and other parameters Rn-222 flux were studied. The factors that most affected the instantaneous value of Rn-222 release were humidity and soil thermal gradient. The directly measured Rn-222 fluxes at inve stigated sites are higher than Rn-222 fluxes derived by the indirect m ethod.